Slow start when using noteOn

[batata004]

Hi my friend,

This library is awesome! But for real time playing, it is very slow. I tracked the reason of the slow execution and it looks like that noteOn creates the source variable everytime it runs (based on createBufferSource). Creating this variable, setting gain, effects... make it too slow. Even if I am not using any effect, the if (effects) gets executed.

Isnt it possible for you to implement a faster audio play, like using web audio .play() ? I used other real time libraries and all of them use the play() and everytime it needs to replay it, they use load() -> play() and it gets executed very fast.

Doing so, you could save each node/velocity in the array sources as you already do, and you can simply play it if the index in the array exists everytime the user requests a note, if it does not exist than you create the index and play. This would make your library near 0 latency and would improve a lot its performance and usage!

[gleitz]

That's a great exploration! You can open this issue (or a PR) into the MIDI.js repo.

https://github.com/mudcube/MIDI.js